Function&colon;1&period; Right handgrip adjust seat height&period;2&period; Left handgrip adjust backrest&period;3&period; Level under left seat side can adjust the seat forward and backward&period;4&period; Armrest can up and down&comma; also inside and outside twist&period;5&period; Lumbar support can up and down&period;6&period; Button on the either side of back frame can adjust the angle of back&period;&period;&period;7&period; Adjustable headrest